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Mining the Sky:
A text designed for those interested in the future of mankind on earth and in space. The author asserts that uncountable amounts of metals, fuels, and life-sustaining substances await us in nearby space, to replace the natural resources of the earth depleted through pollution. He seeks to demonstrate in this work that the key to unlocking these storehouses of vital natural resources is man's ingenuity, boldness and scientific know-how. [via]